一种两象限零电压开关准谐振DC-DC转换器设计(英文)

传统的DC-DC转换器由电感、电容构成,通常电感和电容的面积很大,而且在开关导通和关断时的损耗严重。开关电感的两象限DC-DC转换器同时具有高功率密度和高转换效率,但是其开关导通和关断时的功率损耗仍然很严重。软开关技术可以实现开关导通和关断时的零功率损耗,从而大大减小了转换器的功率损耗。文章设计了一种新型的两象限零电压开关DC-DC转换器(ZVS-QRC),有效减小了功率损耗,并提高了功率密度和转换效率。     

Dual sepic PWM switching-mode DC/DC power converter

A steady-state analysis and experimental results for a dual sepic pulse-width-modulated (PWM) DC/DC power converter for both continuous and discontinuous modes of operation are presented. The converter is dual to a sepic converter, but it can also be derived from a forward converter by replacing one of its rectifier diodes with a coupling capacitor. The circuit acts as a step-down or step-up converter, depending on the value of the ON switch duty cycle. The transformerless version of the converter has a positive DC/DC voltage transfer function. Therefore, the circuit is suitable for distributed power systems. Design equations for all circuit components are derived. Experimental results measured at 100 kHz were in good agreement with theoretical predictions     

零电流开关大功率DC/DC双全桥变换器设计

提出了一种基于双全桥结构的单向零电流开关大功率（兆瓦级）DC/DC变换器,该变换器通过采用两个全桥变换器来实现零电流开关,实现了较低的功率损耗和输出滤波电感。为了验证提出的变换器在大功率应用中的有效性,构建了小型样机并在大功率直流电网进行了实际测试。实验证明,相比传统的两种单向大功率全桥变换器,提出变换器所需的滤波电感和半导体器件的功率损耗均较少,分别仅为1.72mH和924.5kW。     

Analysis of a four-level DC/DC buck converter

In this paper, a four-level DC/DC buck power converter is introduced. The primary application for this converter is to regulate the center capacitor voltage in a four-level inverter system. The steady-state and average-value models for the proposed converter are developed and compared in simulation. The converter was constructed in the laboratory and verified on a four-level motor drive system. It was shown that the four-level DC/DC converter provides capacitor voltage balancing and allows higher output voltage utilization from the inverter.     

星载多路输出开关电源的设计

介绍一款星载多路输出开关电源。该电源的设计方法能够满足绝大部分星载多路输出开关电源的需求。重点介绍该电源的部分设计特点,分析工作原理,并给出了设计公式。实践表明,该电源优化了星载开关电源小型化设计,可广泛应用于星载多路开关电源。     

PLECS在DC/DC变换器中的应用

介绍了一种在Matlab/Simulink环境下快速模拟电力电子电路的仿真工具——分段线性电气电路系统(Piece-wise Linear Electronic Circuit System)。通过与其它仿真工具进行比较,分析了Plecs的特点,并介绍了其主要模块。该工具具有仿真速度快、功率半导体元器件理想化和参数设置灵活的特点,非常适合于DC/DC变换器仿真研究。利用Plecs工具,以Buck变换器为例,对DC/DC变换器进行了建模及仿真分析。建模过程及仿真结果表明该仿真工具简便直观、高效快捷和准确性高,为DC/DC变换器的仿真分析提供了一种新方法。     

A Multiple-Port Three-Level DC/DC Converter for HESS with Power Sharing in DC Microgrids

In order to reduce the volume, weight and cost of conventional hybrid energy storage system (HESS) while properly exploring the complementary features of different energy storage devices for DC microgrid applications, this paper proposes a multiple-port three-level DC/DC converter. It possesses multiple ports sharing one front-end three-level DC/DC converter with an inductor and supercapacitor bank. Different types of batteries and/or multiple battery banks can be interfaced through the multiple terminals. Such a converter structure facilitates the cooperation of different energy storage devices to satisfy various power demands of DC microgrids with intermittent renewable generation plants. Moreover, the proposed structure allows power sharing among different energy storage devices, which enables more efficient cooperation of different battery banks or different types of batteries. Experimental results are presented to verify the efficacy of the proposed converter structure and its control.     

Voltage-source charge-pump power-factor-correction AC/DC converters

Voltage-source charge-pump power-factor-correction (VS-CPPFC) AC/DC power converters are proposed in this paper. The PFC converter using the CP concept is first derived. The unity power factor condition is derived and analyzed. The clamping technique is used to satisfy the unity power factor condition. Based on the steady-state analysis, design considerations for the CPPFC stage are discussed. A family of VS-CPPFC topologies is also presented. The proposed VS-CPPFC AC/DC power converter was implemented and tested. The experimental results show that 83.5% efficiency and 0.996 power factor can be achieved for a half-bridge CPPFC AC/DC converter with 250-W and 12-V output,     

一种四相交错并联BoostDC／DC变换器的设计

通信电源及分布式电源主要由前级高频整流器、中间级电池组和后级DC／DC变换器组成。DC／DC变换器的输入部分通常采用大功率Boost变换器,以将前级与中间级的直流电压提升至一定的幅度,从而更方便地形成所需提供给负载的各种电压。IntelCPU广泛用于IT工业,其对电源的要求越来越严格,需要提供更低的电压、更大的电流及更快的动态响应。为了改进Buck类型电压调整模块（Voltage Regulator Module,简称VRM）的动态响应要求,广泛使用多相交错并联技术,以实现快速的动态响应且极大地降低输出电流纹波。文章以一个大功率的四相交错并联Boost变换器作为设计实例,详细说明了其工作原理及主要器件的设计与选用;论证了该项技术用于BoostDC／DC变换器的多种优点,从而证明了多相交错并联技术的先进性和实用性。     

DC voltage control and stability analysis of PWM-voltage-typereversible rectifiers

A PWM voltage rectifier has useful characteristics on its DC and AC sides. On its DC side, a DC-link unidirectional voltage is obtained and bidirectional power transfer capability is possible by reversing the flow direction of the DC-link current. On its AC side, near sinusoidal current waveforms and AC four-quadrant operation can be obtained, leading to high-quality power being exchanged between the power converter and the mains. The use of AC filters becomes unnecessary. The rectifier DC voltage must be regulated to a constant value. In this paper, three solutions for the DC voltage control are presented. In the first solution, the DC voltage is controlled by acting upon the quadrature component of the power converter fundamental Park's voltages with relation to the mains voltages. Slow responses are necessary because of stability reasons. Also, load power variations produce both active and reactive power variations in the power converter AC side. To improve the DC voltage response, a second control solution is presented. The power converter currents in Park's coordinates must be controlled. The DC voltage is controlled by controlling the direct Park's current component and, thus, acting only on the active power of the converter AC side. Faster responses are achieved. In this case, load power variations do not produce reactive power variations in the converter AC side. The third control solution is a simplified version of this last one. Experimental results from a 2 kVA IGBT-based prototype showing good system dynamic performance are presented     

一种基于GaN器件大功率双向DC/DC变换器

本文介绍了一种新的高功率双向隔离式DC/DC变换器。DC/DC转换器使用基于氮化镓(GaN)的功率开关器件。本文对10 kW GaN大功率DC/DC变换器的拓扑结构进行了优化,参数化和分析,并通过仿真和验证了其有效性。它由两个单相全桥电路、两个输入输出电感和一个高频变压器组成。高频变压器在实现两个全桥变换器之间的电流隔离方面起着至关重要的作用。使用MATLAB仿真软件对10 kW的变换器进行了建模。MATLAB仿真结果验证了变换器的性能适合于高功率应用并能实现轻负载条件下的零电压开通(ZVS)和零电流关断(ZCS)。然后,设计了一个7 kW的实验原型,以验证所设计拓扑的有效性。     

单端正激变换器混合离散优化设计

本文讨论了四路输出单端正激变换器功率变换级的优化设计方法,给出了优化数学模型。其优化设计方法能直接用于工程设计。文中给出了一个实例及计算结果。     

基于滑模控制的双向直流变换器研究

针对光伏电池本身的局限性,需要利用蓄电池来辅助对负载供电。文中所设计的双向直流变换器主要用于对蓄电池的充放电,以双向直流变换器的状态空间平均模型为基础,设计了一种新型的滑模控制器。通过实验仿真验证了基于该滑模控制器的双向直流变换器在开关管交替导通状态下能有效地减小稳态误差,且输出较稳定,能使系统具有更高的稳定性和更好的瞬时性。     

基于MATLAB的数字式DC／DC开关电源系统建模

数字电源的开发是电源的发展趋势,有着更加灵活的控制性能,更加稳定的系统输出,并且可以防止系统老化等诸多优势。文中以数字电源系统结构为基础,使用MATLAB这一功能强大的数学处理工具,分别完成了DC／DC变换器,PID（比例、积分、微分）控制算法以及数字式脉冲宽度调制技术（DPWM）;接着利用MATLAB的绘图功能,在对DC／DC变换器主结构与反馈回路进行系统联调后,清晰地给出了控制算法的实现效果图,为数字电源算法的验证及其程序化搭建了一个简捷明了的平台。     

基于PEV的双向DC/DC变换器的研究

介绍了一种纯电动汽车超级电容器充放电系统的大功率双向DC/DC变换器。首先给出了纯电动汽车电传动系统的结构图,然后介绍了双向DC/DC变换器的拓扑,并针对超级电容器充放电系统设计双向DC/DC变换器的控制器。     

一种新型DC/DC变换器实验系统开发

为强化DC/DC变换技术的实践教学,基于多绕组变压器和反激电路原理,开发一套DC/DC变换器教学系统。设计变换器的拓扑结构,分析工作原理及控制策略,计算变换器系统参数,建立数字仿真模型,设计变换器主电路、输出电压采样电路、开关管驱动电路等来搭建变换器实验平台。实验教学应用表明,该变换器实现宽输入/输出电压范围功能的同时,能够提高学生的电力电子技术综合实践能力。     

High density packaging of the passive components in an automotive DC/DC converter

In this paper, a very high power density DC/DC converter module for automotive applications is investigated. The 14-V/42-V converter is specified to operate at a power level of 2.1 kW with a water cooled heat sink at 85/spl deg/C. The design and implementation of very high density passive components are discussed. Using the results of the passive component design, a prototype converter is built, achieving a final power density of 170W/in/sup 3/. The thermal performance of the passive components and the converter module under different electrical and thermal excitations is investigated and recorded. Results are presented over the full excitation range.     

A high-frequency forward DC/DC converter topology with transformerflux balancing capability

The analysis and design of a high-frequency forward DC/DC power converter topology with transformer flux balancing capability is presented. The converter utilizes a main switch for load current commutation and an auxiliary switch for transformer flux balancing. Moreover, the converter topology provides the means to recover the energy associated with the parasitic inductances of the circuit components, thus yielding high efficiency and allowing for high operating frequencies. Experimental results for a 1 kW, 20 kHz prototype unit are presented